WO2018225280A1 - Outil de dressage de formes rotatif et procédé de dressage - Google Patents

Outil de dressage de formes rotatif et procédé de dressage Download PDF

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Publication number
WO2018225280A1
WO2018225280A1 PCT/JP2017/032801 JP2017032801W WO2018225280A1 WO 2018225280 A1 WO2018225280 A1 WO 2018225280A1 JP 2017032801 W JP2017032801 W JP 2017032801W WO 2018225280 A1 WO2018225280 A1 WO 2018225280A1
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WO
WIPO (PCT)
Prior art keywords
abrasive grains
diamond abrasive
grindstone
rotary dresser
octahedral
Prior art date
Application number
PCT/JP2017/032801
Other languages
English (en)
Japanese (ja)
Inventor
勧 中野
真司 柳沢
貞雄 榊原
Original Assignee
日本精工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本精工株式会社 filed Critical 日本精工株式会社
Priority to KR1020197032460A priority Critical patent/KR20200016204A/ko
Priority to EP17912894.7A priority patent/EP3616838B1/fr
Priority to CN201780091516.3A priority patent/CN110691674B/zh
Priority to US16/084,792 priority patent/US10537976B2/en
Publication of WO2018225280A1 publication Critical patent/WO2018225280A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/06—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels
    • B24B53/07—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels by means of forming tools having a shape complementary to that to be produced, e.g. blocks, profile rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/12—Dressing tools; Holders therefor
    • B24B53/14—Dressing tools equipped with rotary rollers or cutters; Holders therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with cooling provisions, e.g. with radial slots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/14—Zonally-graded wheels; Composite wheels comprising different abrasives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D2203/00—Tool surfaces formed with a pattern

Definitions

  • the present invention relates to a total type rotary dresser and a dressing method.
  • a diamond dresser is generally used for dressing a CBN grindstone.
  • the dressing frequency is increased from the viewpoint of high-precision continuous production, and the dressing time is also required to be shortened in order to shorten the tact time.
  • the diamond dresser has become a problem that it has a short life and causes an increase in cost. Therefore, a technique for improving the wear resistance and extending the life of the diamond dresser has been developed.
  • Patent Document 1 discloses a rotary diamond dresser in which one crystal face of an octahedral diamond abrasive grain is implanted so as to be substantially parallel to the outer periphery of the dresser with the main purpose of improving the wear resistance of the diamond dresser.
  • Patent Document 2 discloses a rotary diamond dresser in which any one of the ridge lines of octahedral diamond abrasive grains is implanted so as to be exposed substantially parallel to the relative rotational speed vector of the grindstone.
  • Patent Document 3 discloses a rotary diamond dresser in which spiral concave grooves are embedded and diamond abrasive grains are arranged at a density of 150 pieces / cm 2 or more on the surface excluding the grooves.
  • This invention is made
  • the objective is to provide the total type
  • the slit region is provided in a plurality inclined with respect to the rotation axis,
  • a total rotary dresser in which a plurality of octahedral diamond abrasive grains are arranged with one of the octahedrons parallel to the outer peripheral surface along an edge on the downstream side in the rotation direction of the slit region.
  • a plurality of slit regions in which diamond abrasive grains are not disposed are provided to be inclined with respect to the rotation axis, and one of a plurality of octa diamond abrasive particles is provided along an edge on the downstream side in the rotation direction of the slit region.
  • the surface is arranged in parallel with the outer peripheral surface in contact with the grindstone.
  • the grindstone is dressed with the hardest diamond crystal surface of the octadiamond abrasive grains. Therefore, the wear resistance of the general rotary dresser can be improved, and the coolant supplied to the slit region can promote the discharge of the dropped abrasive grains and maintain the sharpness of the general rotary dresser over a long period of time.
  • the octahedral diamond abrasive grains are arranged at substantially equal intervals along the edge, In the pair of slit regions adjacent to each other in the rotation direction, the row of octahedral diamond abrasive grains in one slit region and the row of octahedral diamond abrasive grains in the other slit region are the octahedral diamond abrasives.
  • the total type rotary dresser according to (1) wherein the grains are arranged so as to be displaced from each other in the direction of the rotation axis. According to this total type rotary dresser, the entire surface of the grindstone can be dressed with high shape transfer accuracy by a small number of octahedral diamond abrasive grains.
  • the diamond abrasive grains include the octahedral diamond abrasive grains and diamond abrasive grains having a shape different from the octahedral diamond abrasive grains (1) to (4).
  • Total rotary dresser According to this total type rotary dresser, since octahedral diamond abrasive grains are provided only at a specific portion, it is possible to reduce the man-hours and material costs of the dresser while maintaining desired processing accuracy.
  • It has a region where diamond abrasive grains are dispersed and arranged on an outer peripheral surface in contact with the grindstone, and a slit region where the diamond abrasive particles are not arranged, and the slit region is inclined with respect to the rotation axis.
  • the wear resistance of the total rotary dresser can be improved and the abrasive that has fallen off due to the coolant supplied to the slit. Grain discharge is promoted, and the sharpness of the total rotary dresser can be maintained over a long period of time.
  • the dressing method according to (6) wherein the diamond abrasive grains include the octahedral diamond abrasive grains and diamond abrasive grains having a shape different from the octahedral diamond abrasive grains.
  • the running cost of the dresser can be reduced while maintaining the processing accuracy by using the total type rotary dresser provided with the octahedral diamond abrasive grains only in a specific portion.
  • the total rotary dresser can have both excellent wear resistance and excellent sharpness and a long life.
  • FIG. 5 is a schematic VV line cross-sectional view of the grindstone and the rotary dresser shown in FIG. 1 (B). It is a typical perspective view which shows an example of a total type rotary dresser.
  • FIG. 1A is a schematic partial configuration diagram showing a processing position of the grinding apparatus 100
  • FIG. 1B is a schematic partial configuration diagram showing a dressing position of the grinding apparatus 100.
  • the grinding apparatus 100 includes a chuck 11, a grindstone 19, a quill 13 that moves and rotationally drives the grindstone 19, and a total rotary dresser 15 that dresses the grindstone 19.
  • the grinding wheel 19 is used to grind the outer ring raceway surface of the ball bearing.
  • the chuck 11 is provided with a ball bearing outer ring 17 which is a workpiece, and rotationally drives the ball bearing outer ring 17 at a processing position shown in FIG.
  • the quill 13 pivotally supports a grindstone 19 for grooving so that the grindstone 19 can be rotationally driven, and the grindstone 19 can be moved to the above-described machining position and the dressing position by the general rotary dresser 15 shown in FIG. Composed.
  • the total type rotary dresser 15 is pivotally supported at a position where the rotation axis Ax is parallel to the rotation axis of the grindstone 19 and can contact the grinding surface 19a of the grindstone 19.
  • the support shaft 20 of the total rotary dresser 15 is rotationally driven through a pulley 23 by a drive belt 21 connected to a drive source (not shown).
  • the total type rotary dresser 15 may be configured to be rotationally driven by various driving methods such as a method directly driven by a motor or a method driven via a gear.
  • the grindstone 19 arranged at the processing position shown in FIG. 1A is rotated by the drive of the quill 13 and is given a radial cut D1 toward the ball bearing outer ring 17, and the raceway surface 17 a of the ball bearing outer ring 17. Grind. Thereby, the outer peripheral surface shape of the grindstone 19 is transferred to the raceway surface 17a. After the grinding, the grindstone 19 is retracted in the radial direction, and the processed ball bearing outer ring 17 is removed from the chuck 11. Further, the next ball bearing outer ring is attached to the chuck 11, and the raceway surface is ground again.
  • the grindstone 19 is moved in the direction of the arrow D2 to the dressing position by the total rotary dresser 15 by driving the quill 13, as shown in FIG. Then, the grindstone 19 is moved in the radial direction toward the total rotary dresser 15. Then, the outer peripheral surface of the grindstone 19 comes into contact with the outer peripheral surface of the total rotary dresser 15, and the grindstone 19 is dressed while rotating with each other.
  • the rotation direction of the general-purpose rotary dresser 15 and the grindstone 19 may be the same direction, or may be opposite directions. Further, the rotational speeds of the overall rotary dresser 15 and the grindstone 19 are appropriately selected according to conditions.
  • FIG. 2 is a partial cross-sectional view of the total type rotary dresser 15.
  • the total rotary dresser 15 includes a support shaft 20 and a sintered metal portion 25 made of WC (tungsten carbide).
  • the sintered metal part 25 is provided on the outer periphery of the cored bar 20 a of the support shaft 20, and a groove part 29 having a curvature radius R is formed over the entire circumference at the center in the axial direction of the large diameter part 27.
  • a large number of abrasive grains made of diamond are implanted on the surface of at least the groove 29 of the sintered metal portion 25, that is, on the outer peripheral surface in contact with the grindstone 19 (see FIG. 1) in the total type rotary dresser 15.
  • the abrasive grains are embedded in the outer surface of the sintered metal portion 25 before the sintered metal portion 25 is sintered, and are integrated by sintering.
  • the shape of an abrasive grain is prepared by machining the surface of the sintered metal part 25 after sintering as needed.
  • FIG. 3 is a schematic plan development view of the groove 29 of the sintered metal part 25 in which abrasive grains are arranged. Note that the arrangement pitch and the arrangement direction of the abrasive grains shown in FIG. 3 are examples, and the total rotary dresser 15 of this configuration is not limited to this arrangement pattern.
  • the abrasive grains include a large number of general diamond abrasive grains 31 and octahedral diamond abrasive grains 33 (octahedron diamond, hereinafter referred to as octa diamond abrasive grains) having an octahedral structure.
  • octa diamond abrasive grains octahedron diamond, hereinafter referred to as octa diamond abrasive grains having an octahedral structure.
  • the diamond abrasive grains 31 and the octa diamond abrasive grains 33 will be described separately. That is, it is assumed that the diamond abrasive grains 31 do not include the octa diamond abrasive grains 33.
  • the diamond abrasive grains 31 are diamond grains that are widely used in general, such as synthetic diamonds used for diamond tools and metal-coated synthetic diamonds.
  • the octa diamond abrasive grains 33 are octahedral diamonds different from the general diamond abrasive grains 31 as shown in FIG.
  • the octa diamond abrasive grains 33 are diamonds having eight equilateral triangular surfaces 37 which are the hardest diamond crystal planes to be the (111) plane.
  • the direction parallel to the ridgeline 39 in the octahedron is the hardest direction.
  • the diamond abrasive grains 31 and the octa diamond abrasive grains 33 are dispersed and arranged on the outer peripheral surface of the sintered metal portion 25.
  • the diamond abrasive grains 31 In the abrasive grain arrangement pattern shown in FIG. In the region where the diamond abrasive grains 31 are arranged, the diamond abrasive grains 31 have a pitch P1 in the direction of the rotation axis Ax on the inclined line La (1) inclined at an angle ⁇ with respect to the rotation axis Ax of the total rotary dresser 15. Are arranged at substantially equal intervals.
  • the array of the diamond abrasive grains 31 along the inclined line La (1) is provided in the same manner in a plurality of rows with an interval ta in the rotation direction. That is, a plurality of diamond abrasive grains 31 are arranged at equal intervals along each of the inclined lines La (1) to La (n) [n is an integer].
  • Each inclined line La (1) to La (n) has a spiral shape in which a plurality of spirals are arranged side by side on the plan development view of the outer peripheral surface of the sintered metal portion 25 shown in FIG.
  • the diamond abrasive grains 31 of the inclined lines adjacent to each other in the rotational direction are arranged with the pitch P1 in the rotational axis direction shifted from each other (as an example in the illustrated example, (Indicated as a deviation of 1/2 of the pitch P1)
  • positioning of the diamond abrasive grain 31 at the time of dressing can be made shorter than the pitch P1 for 1 row. Therefore, the accuracy of shape transfer can be improved, and the grindstone after transfer can be ground with a stable curved surface.
  • a slit region SL in which the diamond abrasive grains 31 and the octa diamond abrasive grains 33 are not arranged is arranged on the outer peripheral surface of the total rotary dresser 15 along the rotation direction in parallel with the inclined lines La (1) to La (n). Are provided at multiple locations.
  • the slit region SL is provided with a predetermined slit width in the rotation direction.
  • the slit region SL may be constituted by an outer peripheral surface in which the diamond abrasive grains 31 and the octa diamond abrasive grains 33 are not simply arranged, or may be constituted by a groove having a predetermined width and depth.
  • the plurality of octa diamond abrasive grains 33 are provided along the downstream edge of each slit region SL in the rotation direction.
  • the respective octa diamond abrasive grains 33 are arranged at substantially equal intervals with a pitch P2 that is substantially the same as the pitch P1 of the diamond abrasive grains 31 described above with respect to the rotation axis Ax direction.
  • the octadiamond abrasive grains 33 are arranged such that one of the eight faces of the octahedron is parallel to the outer peripheral surface serving as a contact surface with the grindstone 19.
  • the octadiamond abrasive grains 33 that are adjacent to each other in the rotational direction across the inclined lines La (1) to La (n) are arranged so as to be shifted from each other in the rotational axis Ax direction (in the illustrated example, the pitch P2 is an example). Shown as 1 ⁇ 2 deviation).
  • the row Lb of octa diamond abrasive grains 33 is provided with an interval tb in the rotational direction between the inclined line La (1) that is a row of diamond abrasive grains 31 arranged downstream in the rotational direction of the row Lb. It is done.
  • the interval tb may be substantially equal to or different from each interval ta of the inclined lines La (1) to La (n) described above.
  • the diamond abrasive grains 31 and the octa diamond abrasive grains 33 are discretely arranged at intervals in the abrasive grain arrangement area excluding the slit area SL on the outer peripheral surface of the total type rotary dresser 15.
  • the amount of deviation of the diamond abrasive grains 31 and the octa diamond abrasive grains 33 in the direction of the rotation axis for each inclined line is individually set according to the material and shape of the grinding stone to be dressed.
  • the angle ⁇ in the spiral direction is determined mainly according to the target machinability of the dresser. That is, various parameters such as the intervals ta, tb, pitches P1, P2, and angle ⁇ are used to determine the probability (number of times of contact) that the diamond abrasive grains 31 and the octadiamond abrasive grains 33 are in contact with the grindstone surface during dressing. Are set to be substantially the same. Furthermore, it is set in consideration of machinability and cost.
  • FIG. 5 is a schematic cross-sectional view taken along the line VV of the grindstone 19 and the total rotary dresser 15 shown in FIG.
  • the slit region SL, the octa diamond abrasive grains 33, and the diamond abrasive grains 31 are arranged in this order along the counter-rotating direction on the outer peripheral surface that contacts the grindstone 19 of the total rotary dresser 15. Accordingly, in the total rotary dresser 15, the slit region SL, the octa diamond abrasive grains 33, and the diamond abrasive grains 31 are in contact with the grindstone 19 in this order.
  • the above relationship is the same at any position in the rotation axis direction.
  • FIG. 6 is a schematic external view showing an example of the total type rotary dresser having the above configuration.
  • the total rotary dresser 15 has an abrasive grain arrangement region in which a large number of diamond abrasive grains 31 and octa diamond abrasive grains 33 are dispersed and a slit area SL in which the abrasive grains 31 and 33 are not arranged.
  • Octa diamond abrasive grains 33 are disposed at the downstream edge of the slit region SL in the rotation direction.
  • Normal diamond abrasive grains 31 are arranged in areas other than the arrangement area of the octa diamond abrasive grains 33 in the abrasive grain arrangement area.
  • the octadiamond abrasive grains 33 have the hardest equilateral triangular surface 37 (see FIG. 4) parallel to the outer peripheral surface of the general rotary dresser 15 so that the rotational direction of the general rotary dresser 15 is less likely to wear. It is arranged. Moreover, you may arrange
  • the slit region SL on the upstream side in the rotation direction of the octa diamond abrasive grains 33, the supply of coolant to the dressing point can be promoted.
  • the octa diamond abrasive grains 33 can be brought into contact with the grindstone.
  • the octa diamond abrasive grains 33 can dress a grindstone without being affected by unnecessary substances such as falling abrasive grains.
  • the diamond abrasive grains 31 come into contact with the grindstone for dressing. Therefore, it is possible to realize an ideal dressing process in which the grindstone surface is first roughly crushed by the octa diamond abrasive grains 33 and then the grindstone surface is precisely finished by the diamond abrasive grains 31.
  • the dressing resistance can be reduced and the dressing accuracy can be improved.
  • wear resistance can be improved by using the diamond abrasive grains 31 and the octa diamond abrasive grains 33 in combination.
  • the sharpness due to the combined use of each abrasive grain is avoided by providing the slit region SL.
  • the octa diamond abrasive grain 33 is arrange
  • a new grindstone having a diameter of 27.0 mm was prepared, and this grindstone was dressed and adjusted to an excessive size. After grinding the workpiece, 20 dressings (40 ⁇ m in diameter per dressing) were applied by 1 ⁇ m, and when the diameter of the grindstone was too small, the life of the grindstone was defined. Note that the dress spark-out (dress S.O), which is the holding time in the state where the cutting operation is completed, was set to 0.5 sec.
  • the number of workpieces produced after dressing was 400 for skip 1, 300 for skip 2, 200 for skip 3, and 150 for skip 4.
  • the number of workpieces produced until the total type rotary dresser reaches the end of its life was 445,000 on average in the test results of five times.
  • the total value of the rotary rotary dresser of the conventional product was 289 thousand in 9 tests, and it was confirmed that the life of the rotary rotary dresser of the present invention was about 1.5 times longer. .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Abstract

L'invention concerne un outil de dressage de formes rotatif, dans lequel la face circonférentielle extérieure de celui-ci, qui est en contact avec une meule, possède une zone sur laquelle des grains abrasifs de diamant sont disposés de manière dispersée et une zone de fente sur laquelle aucun grain abrasif de diamant n'est disposé. Une pluralité de zones de fente est disposée de manière inclinée par rapport à l'axe de rotation. Le long du bord sur le côté aval de la zone de fente dans le sens de rotation, une pluralité de grains abrasifs de diamant de type octaèdre sont disposés de façon qu'une face de l'octaèdre soit parallèle à la face circonférentielle extérieure.
PCT/JP2017/032801 2017-06-09 2017-09-12 Outil de dressage de formes rotatif et procédé de dressage WO2018225280A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020197032460A KR20200016204A (ko) 2017-06-09 2017-09-12 총형 로터리 드레서 및 드레싱 방법
EP17912894.7A EP3616838B1 (fr) 2017-06-09 2017-09-12 Outil de dressage de formes rotatif et procédé de dressage
CN201780091516.3A CN110691674B (zh) 2017-06-09 2017-09-12 成形旋转式修整器及修整方法
US16/084,792 US10537976B2 (en) 2017-06-09 2017-09-12 Former rotary dresser and dressing method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-114570 2017-06-09
JP2017114570A JP6203980B1 (ja) 2017-06-09 2017-06-09 総型ロータリードレッサー及びドレッシング方法

Publications (1)

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WO2018225280A1 true WO2018225280A1 (fr) 2018-12-13

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PCT/JP2017/032801 WO2018225280A1 (fr) 2017-06-09 2017-09-12 Outil de dressage de formes rotatif et procédé de dressage

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US (1) US10537976B2 (fr)
EP (1) EP3616838B1 (fr)
JP (1) JP6203980B1 (fr)
KR (1) KR20200016204A (fr)
CN (1) CN110691674B (fr)
WO (1) WO2018225280A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5311112B2 (fr) 1974-08-09 1978-04-19
JPS59345B2 (ja) 1976-09-13 1984-01-06 豊田バンモツプス株式会社 トラバ−ス形ロ−タリダイヤモンドドレツサ
JPS591555B2 (ja) 1977-12-23 1984-01-12 豊田バンモツプス株式会社 ロ−タリダイヤモンドドレツサ
JP2012091292A (ja) * 2010-10-27 2012-05-17 Toyoda Van Moppes Ltd ロータリドレッサ
JP2017114570A (ja) 2010-04-12 2017-06-29 アルトリア クライアント サービシーズ エルエルシー 垂直充填装置で生産した袋製品を形成する形成カラー

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Publication number Priority date Publication date Assignee Title
JPS5311112A (en) 1976-07-17 1978-02-01 Metaru Risaachi Kooporeeshiyon High purity ferroosilicon for steel modification
JPS591555A (ja) 1982-06-29 1984-01-06 Dainippon Ink & Chem Inc 含ハロゲン樹脂用安定剤組成物
JPH10329042A (ja) * 1997-04-02 1998-12-15 Toyota Banmotsupusu Kk ダイヤモンドドレッサ
TW200916262A (en) * 1999-11-22 2009-04-16 jian-min Song Contoured cmp pad dresser and associated methods
JP2006043814A (ja) * 2004-08-04 2006-02-16 Asahi Diamond Industrial Co Ltd ワイヤソー及び該ワイヤソー用ビーズ
CN101001720A (zh) * 2004-08-16 2007-07-18 丰田万磨株式会社 旋转式金刚石修整器
JP5042208B2 (ja) * 2008-10-15 2012-10-03 株式会社アライドマテリアル 超砥粒工具およびその製造方法
EP2835220B1 (fr) * 2013-08-07 2019-09-11 Reishauer AG Outil d'ajustement et son procédé de fabrication
GB201504759D0 (en) * 2015-03-20 2015-05-06 Rolls Royce Plc Abrading tool for a rotary dresser

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5311112B2 (fr) 1974-08-09 1978-04-19
JPS59345B2 (ja) 1976-09-13 1984-01-06 豊田バンモツプス株式会社 トラバ−ス形ロ−タリダイヤモンドドレツサ
JPS591555B2 (ja) 1977-12-23 1984-01-12 豊田バンモツプス株式会社 ロ−タリダイヤモンドドレツサ
JP2017114570A (ja) 2010-04-12 2017-06-29 アルトリア クライアント サービシーズ エルエルシー 垂直充填装置で生産した袋製品を形成する形成カラー
JP2012091292A (ja) * 2010-10-27 2012-05-17 Toyoda Van Moppes Ltd ロータリドレッサ

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EP3616838B1 (fr) 2023-08-23
US10537976B2 (en) 2020-01-21
CN110691674A (zh) 2020-01-14
US20190358773A1 (en) 2019-11-28
KR20200016204A (ko) 2020-02-14
JP2018202594A (ja) 2018-12-27
EP3616838A4 (fr) 2020-05-20
JP6203980B1 (ja) 2017-09-27
CN110691674B (zh) 2021-10-08
EP3616838A1 (fr) 2020-03-04

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